Neumann.Berlin DMI-8 - Handbuch (Seite 9)

16 EN 17 EN
8. Troubleshooting
Problem ▶ Possible causes ▶ Solution
The RCS does not indicate that a
microphone is switched on and
connected to the DMI, even though
the “VALID” LED on the DMI is
lit up. The DMI is not recognized by the
RCS software. – Cause:
The DMI was not switched on
at the time when the RCS was
started. Do not start the RCS until the DMI
has been switched on, or execute
the command Options/DMI and
then close the window again.
The same ID has been used for
more than one DMI. Set the ID by means of the coding
switch on the back of the DMI;
each DMI must have a diff erent ID!
The ID has been changed while the
DMI was in operation. After an ID is changed, the DMI
must be restarted. Then restart
the RCS, or execute the command
Options/DMI and then close the
window again.
Incorrect interface setting (USB,
COM1 or COM2). Select the correct interface in the
RCS via the command Options/
Communication.
The “Ext. Word Clk” LED is not lit
up, even though an external word
clock has been connected. No word clock signal has been
detected. Check the source of the word clock
signal and the cable connection.
The “Ext. Word Clk” LED blinks
continuously. (Blinking for a short
period following activation of an
external word clock is normal, and
indicates that the synchronization
process is being carried out). A word clock signal is present,
but has not been interpreted as a
valid signal. This can occur, for ex-
ample, if the word clock frequency
deviates by more than ±50 ppm
from the nominal value. Check the word clock frequency or
select another source for the word
clock signal. Alternatively, remove
the external word clock and use
the DMI internal word clock as the
master word clock for the signal
chain.
The “VALID” LED is not lit up, even
though a microphone is connected
and switched on. (The RCS “Mic
PWR” display is lit up). No valid data stream – Cause:
The microphone cable connection
is faulty or too long.
Check to ensure a continuous
cable connection.
Comply with the recommended
maximum cable length and
required cable quality, as appli-
cable for the selected word clock
frequency. Avoid unnecessary
transition points (connectors). See
Section 7.2, Cables.
Problem ▶ Possible causes ▶ Solution
The “VALID” LED blinks continu-
ously. (Blinking for a short period
during the synchronization process
is normal). The microphone has not been
synchronized because the se-
lected word clock frequency is not
supported. Select a word clock frequency that
it is supported by all of the con-
nected microphones.
The microphone supports only
“mode 1” in accordance with the
AES42 standard, i.e. it cannot be
synchronized. Use a microphone that can be
synchronized (any Neumann Solu-
tion-D series microphones).
Functions cannot be controlled via
the user port. Control via the user port has not
been activated. In the RCS system menu, “Func-
tion controlled by user port”
must be activated for the relevant
functions.
signal recovered from the microphone signal,
and the word clock of the DMI-8. From the phase
deviation thus determined, the DMI-8 calculates a
control signal which is transmitted via the remote
control data stream to the microphone, where it
controls the frequency of the internal quartz os-
cillator. Via the BNC output, the internal word clock gen-
erator of the DMI-8 can be used to synchronize
additional DMIs and connected equipment, such
as a mixing console.